Symbiotic Wildlife
Informational (nonfiction) 2,577 words, Level Z2 (Grade 5+), Lexile 1180L
Multilevel Book also available at other levels of text complexity.
The natural world is full of complex relationships among different kinds of organisms. Symbiotic Wildlife is a nonfiction informational book that looks at how different species interact in ways that benefit each other. The book can also be used to teach students how to compare and contrast information and the proper use of commas in a series. 
Multilevel Book also available at other levels of text complexity.